Performance of static MDCT beam-shaping filtration for elliptical subject geometries in dependence of projection angle

Ziele: MDCT beam-shaping filters modulate X-ray beam intensity across the fan, compensating for decreasing absorption due to shorter X-ray path lengths through patient body periphery compared to its center. To investigate projection-angle dependence of detector statistics for elliptical subject geometries, performance of experimentally measured filter geometry and theoretical filter geometry adapted to elliptical specimen has been compared. Methode: Using a Compton spectrometer, primary MDCT X-ray spectra (120kVp) have been measured at different angular distance (0°–21°) from the central ray of the X-ray fan. Th…